<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      //   var usename = "123456";
      //   console.log(usename);
      //   var a1 = "法外狂徒张三";
      //   console.log(a1);
      //   var $1 = "法外狂徒";
      //   console.log($1);
      //   1.只能用数字 字母  下划线  $命名
    </script>
  </body>
</html>
